<template>
  <div class="component-upload-image">
    <el-upload :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
      name="file" :on-remove="handleRemove" :show-file-list="true" :headers="headers" :file-list="fileList"
      :on-preview="handlePictureCardPreview" :class="{ hide: this.fileList.length >= this.limit }"
      :style="{ zoom: zoom }">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的文件
    </div>

    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <!-- <div style="width: 300px;height: auto;"> -->
      <video
        ref="veo" v-if="isVideo" :poster="veoPoster" width="100%" height="300px" controls="controls" :src="dialogImageUrl"></video>
      <img v-else :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
      <!-- </div> -->

    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    zoom: {
      type: Number,
      default: 1,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    // 是否需要数组格式
    isArray: {
      type: Boolean,
      default: false,
    },
    // 是否上传视频
    isVideo: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      veoPoster : "",
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: []
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              if (item.indexOf(process.env.VUE_APP_BASE_IMAGE_URL) === -1) {
                item = { name: process.env.VUE_APP_BASE_IMAGE_URL + item, url: process.env.VUE_APP_BASE_IMAGE_URL + item };
              } else {
                item = { name: item, url: item };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {

    getVideoBase64(url) {
        let dataURL = '';
        let video = document.createElement("video");
        video.setAttribute('crossOrigin', 'anonymous');//处理跨域
        video.setAttribute('src', url);
        video.setAttribute('width', 400);
        video.setAttribute('height', 240);
        video.setAttribute('preload', 'auto');
        video.addEventListener('loadeddata', function () {
          let canvas = document.createElement("canvas"),
            width = video.width, //canvas的尺寸和图片一样
            height = video.height;
          canvas.width = width;
          canvas.height = height;
          canvas.getContext("2d").drawImage(video, 0, 0, width, height); //绘制canvas
          dataURL = canvas.toDataURL('image/jpeg'); //转换为base64
          this.veoPoster = dataURL;
        });

    },

    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        let fileList = this.listToString(this.fileList);
        if (this.isArray && fileList) {
          fileList = fileList.split(',');
        }
        this.$emit("input", fileList);
      }
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      this.fileList.push({ name: res.fileName, url: res.fileName });
      let fileList = this.listToString(this.fileList);
      if (this.isArray) {
        fileList = fileList.split(',');
      }
      this.$emit("input", fileList);
      this.loading.close();
      this.$emit('success', res);
      console.log('成功回调--', res);
      if (this.isVideo) {
       this.getVideoBase64(res.url);
      }

    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      console.log('file>>', file);
      if (this.isVideo) {
        if (['video/mp4', 'video/ogg', 'video/flv', 'video/avi', 'video/wmv', 'video/rmvb'].indexOf(file.type) == -1) {
          this.$message.error('上传视频只能是 mp4、ogg、flv、avi、wmv、rmvb 格式!');
          return false;
        }
        this.loading = this.$loading({
          lock: true,
          text: "上传中",
          background: "rgba(0, 0, 0, 0.7)",
        });
      } else {
        let isImg = false;
        if (this.fileType.length) {
          let fileExtension = "";
          if (file.name.lastIndexOf(".") > -1) {
            fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
          }
          isImg = this.fileType.some(type => {
            if (file.type.indexOf(type) > -1) return true;
            if (fileExtension && fileExtension.indexOf(type) > -1) return true;
            return false;
          });
        } else {
          isImg = file.type.indexOf("image") > -1;
        }

        if (!isImg) {
          this.$message.error(
            `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
          );
          return false;
        }
        if (this.fileSize) {
          const isLt = file.size / 1024 / 1024 < this.fileSize;
          if (!isLt) {
            this.$message.error(`上传图片大小不能超过 ${this.fileSize} MB!`);
            return false;
          }
        }
        this.loading = this.$loading({
          lock: true,
          text: "上传中",
          background: "rgba(0, 0, 0, 0.7)",
        });
      }

    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError() {
      this.$message({
        type: "error",
        message: "上传失败",
      });
      this.loading.close();
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url.replace(process.env.VUE_APP_BASE_IMAGE_URL, "") + separator;
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>

